KAYAK and AVIS drop the ball.
Cons: We reserved a mini van around 10 days prior to pickup. We received a phone call the day before asking if we had to have a mini van, if we would want a Ford Explorer instead. I said "no", we needed a minivan. We arrived at 8:30 the next morning, to start our family vacation by renting the minivan, and there was no minivan. The Avis employee said that there had been a glitch on KAYAK and on AVIS website that quoted a lower price on the minivans, therefore causing them all to be rented. There was no minivan there, even though they called me the night before asking me if I wanted something different, and I told them no. They again asked if I wanted an Explorer, and I told them "no" again. They didn't even have an Explorer on site to rent. After waiting for 20 minutes, nothing happened. No minivan, no Explorer, nothing. I called ENTERPRISE and reserved an minivan over the phone, which was DOUBLE the rate that KAYAK/AVIS quoted me, but it was available immediately. I still have received no explanation from KAYAK or AVIS. Probably wont use either of these companies again.